private static void sendFromGMail(String from, String pass, String[] to,
		String subject, String body) {
	Properties props = System.getProperties();
	String host = "smtp.gmail.com";
	// 下面設定是根據GMail官方文件所寫的，開啟TLS以及SMTP AUTH
	props.put("mail.smtp.starttls.enable", "true");
	props.put("mail.smtp.host", host);
	props.put("mail.smtp.user", from);
	props.put("mail.smtp.password", pass);
	props.put("mail.smtp.port", "587");
	props.put("mail.smtp.auth", "true");
	Session session = Session.getDefaultInstance(props);
	MimeMessage message = new MimeMessage(session);
		try {
		message.setFrom(new InternetAddress(from));
		InternetAddress[] toAddress = new InternetAddress[to.length];
			// To get the array of addresses
	for (int i = 0; i < to.length; i++) {
			toAddress[i] = new InternetAddress(to[i]);
		}
			for (int i = 0; i < toAddress.length; i++) {
			message.addRecipient(Message.RecipientType.TO, toAddress[i]);
		}
			message.setSubject(subject);
		message.setText(body);
		Transport transport = session.getTransport("smtp");
		transport.connect(host, from, pass);
		transport.sendMessage(message, message.getAllRecipients());
		transport.close();
	} catch (AddressException ae) {
		ae.printStackTrace();
	} catch (MessagingException me) {
		me.printStackTrace();
	}
}